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Research, Development and Evaluation Commission once hold an Internet election of “Top Ten Complaints”, the result showed that the overabundance of phone and Internet fraud was included. This result represents that the phone and Internet fraud trouble people a lot. Thus, this paper will first discuss the analysis of the crime mode of phone and Internet fraud and the collect the security threats of VoIP. Then this paper will analyze the threats one-by-one and comes up with different reacting policies. Furthermore, this paper also to provide the VoIP Digital Evidence Forensics Standard Operating Procedures (DEFSOP) in order to help the police organizations and sets up an experimenting platform which is able to operate phone calls, attacks and forensics to test and verify the research.